2 * ext_attr.c --- extended attribute blocks
4 * Copyright (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
6 * Copyright (C) 2002 Theodore Ts'o.
9 * This file may be redistributed under the terms of the GNU Library
10 * General Public License, version 2.
22 #if defined HAVE_SYS_XATTR_H
23 #include <sys/xattr.h>
24 #elif defined HAVE_ATTR_XATTR_H
25 #include <attr/xattr.h>
29 #include "ext2_ext_attr.h"
34 static errcode_t read_ea_inode_hash(ext2_filsys fs, ext2_ino_t ino, __u32 *hash)
36 struct ext2_inode inode;
39 retval = ext2fs_read_inode(fs, ino, &inode);
42 *hash = ext2fs_get_ea_inode_hash(&inode);
46 #define NAME_HASH_SHIFT 5
47 #define VALUE_HASH_SHIFT 16
50 * ext2_xattr_hash_entry()
52 * Compute the hash of an extended attribute.
54 __u32 ext2fs_ext_attr_hash_entry(struct ext2_ext_attr_entry *entry, void *data)
57 char *name = ((char *) entry) + sizeof(struct ext2_ext_attr_entry);
60 for (n = 0; n < entry->e_name_len; n++) {
61 hash = (hash << NAME_HASH_SHIFT) ^
62 (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^
66 /* The hash needs to be calculated on the data in little-endian. */
67 if (entry->e_value_inum == 0 && entry->e_value_size != 0) {
68 __u32 *value = (__u32 *)data;
69 for (n = (entry->e_value_size + EXT2_EXT_ATTR_ROUND) >>
70 EXT2_EXT_ATTR_PAD_BITS; n; n--) {
71 hash = (hash << VALUE_HASH_SHIFT) ^
72 (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^
73 ext2fs_le32_to_cpu(*value++);
81 * ext2fs_ext_attr_hash_entry2()
83 * Compute the hash of an extended attribute.
84 * This version of the function supports hashing entries that reference
85 * external inodes (ea_inode feature).
87 errcode_t ext2fs_ext_attr_hash_entry2(ext2_filsys fs,
88 struct ext2_ext_attr_entry *entry,
89 void *data, __u32 *hash)
91 *hash = ext2fs_ext_attr_hash_entry(entry, data);
93 if (entry->e_value_inum) {
97 retval = read_ea_inode_hash(fs, entry->e_value_inum,
102 *hash = (*hash << VALUE_HASH_SHIFT) ^
103 (*hash >> (8*sizeof(*hash) - VALUE_HASH_SHIFT)) ^
109 #undef NAME_HASH_SHIFT
110 #undef VALUE_HASH_SHIFT
112 #define BLOCK_HASH_SHIFT 16
114 /* Mirrors ext4_xattr_rehash() implementation in kernel. */
115 void ext2fs_ext_attr_block_rehash(struct ext2_ext_attr_header *header,
116 struct ext2_ext_attr_entry *end)
118 struct ext2_ext_attr_entry *here;
121 here = (struct ext2_ext_attr_entry *)(header+1);
122 while (here < end && !EXT2_EXT_IS_LAST_ENTRY(here)) {
124 /* Block is not shared if an entry's hash value == 0 */
128 hash = (hash << BLOCK_HASH_SHIFT) ^
129 (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^
131 here = EXT2_EXT_ATTR_NEXT(here);
133 header->h_hash = hash;
137 * Re-compute the extended attribute hash value after an entry has changed.
139 static void ext2fs_attr_rehash(struct ext2_ext_attr_header *header,
140 struct ext2_ext_attr_entry *entry)
142 struct ext2_ext_attr_entry *here;
145 entry->e_hash = ext2fs_ext_attr_hash_entry(entry, (char *)header +
146 entry->e_value_offs);
148 here = ENTRY(header+1);
149 while (!EXT2_EXT_IS_LAST_ENTRY(here)) {
151 /* Block is not shared if an entry's hash value == 0 */
155 hash = (hash << BLOCK_HASH_SHIFT) ^
156 (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^
158 here = EXT2_EXT_ATTR_NEXT(here);
160 header->h_hash = hash;
163 #undef BLOCK_HASH_SHIFT
165 __u32 ext2fs_get_ea_inode_hash(struct ext2_inode *inode)
167 return inode->i_atime;
170 void ext2fs_set_ea_inode_hash(struct ext2_inode *inode, __u32 hash)
172 inode->i_atime = hash;
175 __u64 ext2fs_get_ea_inode_ref(struct ext2_inode *inode)
177 return ((__u64)inode->i_ctime << 32) | inode->osd1.linux1.l_i_version;
180 void ext2fs_set_ea_inode_ref(struct ext2_inode *inode, __u64 ref_count)
182 inode->i_ctime = (__u32)(ref_count >> 32);
183 inode->osd1.linux1.l_i_version = (__u32)ref_count;
186 static errcode_t check_ext_attr_header(struct ext2_ext_attr_header *header)
188 if ((header->h_magic != EXT2_EXT_ATTR_MAGIC_v1 &&
189 header->h_magic != EXT2_EXT_ATTR_MAGIC) ||
190 header->h_blocks != 1)
191 return EXT2_ET_BAD_EA_HEADER;
196 errcode_t ext2fs_read_ext_attr3(ext2_filsys fs, blk64_t block, void *buf,
202 retval = io_channel_read_blk64(fs->io, block, 1, buf);
206 if (!(fs->flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) &&
207 !ext2fs_ext_attr_block_csum_verify(fs, inum, block, buf))
210 #ifdef WORDS_BIGENDIAN
211 ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1);
214 retval = check_ext_attr_header(buf);
215 if (retval == 0 && csum_failed)
216 retval = EXT2_ET_EXT_ATTR_CSUM_INVALID;
221 errcode_t ext2fs_read_ext_attr2(ext2_filsys fs, blk64_t block, void *buf)
223 return ext2fs_read_ext_attr3(fs, block, buf, 0);
226 errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
228 return ext2fs_read_ext_attr2(fs, block, buf);
231 errcode_t ext2fs_write_ext_attr3(ext2_filsys fs, blk64_t block, void *inbuf,
237 #ifdef WORDS_BIGENDIAN
238 retval = ext2fs_get_mem(fs->blocksize, &write_buf);
241 ext2fs_swap_ext_attr(write_buf, inbuf, fs->blocksize, 1);
243 write_buf = (char *) inbuf;
246 retval = ext2fs_ext_attr_block_csum_set(fs, inum, block,
247 (struct ext2_ext_attr_header *)write_buf);
251 retval = io_channel_write_blk64(fs->io, block, 1, write_buf);
252 #ifdef WORDS_BIGENDIAN
253 ext2fs_free_mem(&write_buf);
256 ext2fs_mark_changed(fs);
260 errcode_t ext2fs_write_ext_attr2(ext2_filsys fs, blk64_t block, void *inbuf)
262 return ext2fs_write_ext_attr3(fs, block, inbuf, 0);
265 errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
267 return ext2fs_write_ext_attr2(fs, block, inbuf);
271 * This function adjusts the reference count of the EA block.
273 errcode_t ext2fs_adjust_ea_refcount3(ext2_filsys fs, blk64_t blk,
274 char *block_buf, int adjust,
275 __u32 *newcount, ext2_ino_t inum)
278 struct ext2_ext_attr_header *header;
281 if ((blk >= ext2fs_blocks_count(fs->super)) ||
282 (blk < fs->super->s_first_data_block))
283 return EXT2_ET_BAD_EA_BLOCK_NUM;
286 retval = ext2fs_get_mem(fs->blocksize, &buf);
292 retval = ext2fs_read_ext_attr3(fs, blk, block_buf, inum);
296 header = BHDR(block_buf);
297 if (header->h_magic != EXT2_EXT_ATTR_MAGIC)
298 return EXT2_ET_EA_BAD_MAGIC;
300 header->h_refcount += adjust;
302 *newcount = header->h_refcount;
304 retval = ext2fs_write_ext_attr3(fs, blk, block_buf, inum);
310 ext2fs_free_mem(&buf);
314 errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk,
315 char *block_buf, int adjust,
318 return ext2fs_adjust_ea_refcount3(fs, blk, block_buf, adjust,
322 errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk,
323 char *block_buf, int adjust,
326 return ext2fs_adjust_ea_refcount2(fs, blk, block_buf, adjust,
330 /* Manipulate the contents of extended attribute regions */
336 unsigned int value_len;
340 struct ext2_xattr_handle {
343 struct ext2_xattr *attrs;
351 static errcode_t ext2fs_xattrs_expand(struct ext2_xattr_handle *h,
352 unsigned int expandby)
354 struct ext2_xattr *new_attrs;
357 err = ext2fs_get_arrayzero(h->capacity + expandby,
358 sizeof(struct ext2_xattr), &new_attrs);
362 memcpy(new_attrs, h->attrs, h->capacity * sizeof(struct ext2_xattr));
363 ext2fs_free_mem(&h->attrs);
364 h->capacity += expandby;
365 h->attrs = new_attrs;
370 struct ea_name_index {
375 /* Keep these names sorted in order of decreasing specificity. */
376 static struct ea_name_index ea_names[] = {
378 {3, "system.posix_acl_default"},
379 {2, "system.posix_acl_access"},
380 {8, "system.richacl"},
389 static const char *find_ea_prefix(int index)
391 struct ea_name_index *e;
393 for (e = ea_names; e->name; e++)
394 if (e->index == index)
400 static int find_ea_index(const char *fullname, const char **name, int *index)
402 struct ea_name_index *e;
404 for (e = ea_names; e->name; e++) {
405 if (strncmp(fullname, e->name, strlen(e->name)) == 0) {
406 *name = fullname + strlen(e->name);
414 errcode_t ext2fs_free_ext_attr(ext2_filsys fs, ext2_ino_t ino,
415 struct ext2_inode_large *inode)
417 struct ext2_ext_attr_header *header;
418 void *block_buf = NULL;
421 struct ext2_inode_large i;
425 err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&i,
426 sizeof(struct ext2_inode_large));
432 /* Do we already have an EA block? */
433 blk = ext2fs_file_acl_block(fs, (struct ext2_inode *)inode);
437 /* Find block, zero it, write back */
438 if ((blk < fs->super->s_first_data_block) ||
439 (blk >= ext2fs_blocks_count(fs->super))) {
440 err = EXT2_ET_BAD_EA_BLOCK_NUM;
444 err = ext2fs_get_mem(fs->blocksize, &block_buf);
448 err = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
452 /* We only know how to deal with v2 EA blocks */
453 header = (struct ext2_ext_attr_header *) block_buf;
454 if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
455 err = EXT2_ET_BAD_EA_HEADER;
459 header->h_refcount--;
460 err = ext2fs_write_ext_attr3(fs, blk, block_buf, ino);
464 /* Erase link to block */
465 ext2fs_file_acl_block_set(fs, (struct ext2_inode *)inode, 0);
466 if (header->h_refcount == 0)
467 ext2fs_block_alloc_stats2(fs, blk, -1);
468 err = ext2fs_iblk_sub_blocks(fs, (struct ext2_inode *)inode, 1);
474 err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&i,
475 sizeof(struct ext2_inode_large));
481 ext2fs_free_mem(&block_buf);
486 static errcode_t prep_ea_block_for_write(ext2_filsys fs, ext2_ino_t ino,
487 struct ext2_inode_large *inode)
489 struct ext2_ext_attr_header *header;
490 void *block_buf = NULL;
494 /* Do we already have an EA block? */
495 blk = ext2fs_file_acl_block(fs, (struct ext2_inode *)inode);
497 if ((blk < fs->super->s_first_data_block) ||
498 (blk >= ext2fs_blocks_count(fs->super))) {
499 err = EXT2_ET_BAD_EA_BLOCK_NUM;
503 err = ext2fs_get_mem(fs->blocksize, &block_buf);
507 err = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
511 /* We only know how to deal with v2 EA blocks */
512 header = (struct ext2_ext_attr_header *) block_buf;
513 if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
514 err = EXT2_ET_BAD_EA_HEADER;
518 /* Single-user block. We're done here. */
519 if (header->h_refcount == 1)
522 /* We need to CoW the block. */
523 header->h_refcount--;
524 err = ext2fs_write_ext_attr3(fs, blk, block_buf, ino);
528 /* No block, we must increment i_blocks */
529 err = ext2fs_iblk_add_blocks(fs, (struct ext2_inode *)inode,
535 /* Allocate a block */
536 goal = ext2fs_find_inode_goal(fs, ino, (struct ext2_inode *)inode, 0);
537 err = ext2fs_alloc_block2(fs, goal, NULL, &blk);
540 ext2fs_file_acl_block_set(fs, (struct ext2_inode *)inode, blk);
543 ext2fs_free_mem(&block_buf);
550 posix_acl_xattr_count(size_t size)
552 if (size < sizeof(posix_acl_xattr_header))
554 size -= sizeof(posix_acl_xattr_header);
555 if (size % sizeof(posix_acl_xattr_entry))
557 return size / sizeof(posix_acl_xattr_entry);
561 * The lgetxattr function returns data formatted in the POSIX extended
562 * attribute format. The on-disk format uses a more compact encoding.
563 * See the ext4_acl_to_disk in fs/ext4/acl.c.
565 static errcode_t convert_posix_acl_to_disk_buffer(const void *value, size_t size,
566 void *out_buf, size_t *size_out)
568 const posix_acl_xattr_header *header =
569 (const posix_acl_xattr_header*) value;
570 const posix_acl_xattr_entry *end, *entry =
571 (const posix_acl_xattr_entry *)(header+1);
572 ext4_acl_header *ext_acl;
580 if (size < sizeof(posix_acl_xattr_header))
582 if (header->a_version != ext2fs_cpu_to_le32(POSIX_ACL_XATTR_VERSION))
585 count = posix_acl_xattr_count(size);
587 ext_acl->a_version = ext2fs_cpu_to_le32(EXT4_ACL_VERSION);
592 e = (char *) out_buf + sizeof(ext4_acl_header);
593 s = sizeof(ext4_acl_header);
594 for (end = entry + count; entry != end;entry++) {
595 ext4_acl_entry *disk_entry = (ext4_acl_entry*) e;
596 disk_entry->e_tag = ext2fs_cpu_to_le16(entry->e_tag);
597 disk_entry->e_perm = ext2fs_cpu_to_le16(entry->e_perm);
599 switch(entry->e_tag) {
604 e += sizeof(ext4_acl_entry_short);
605 s += sizeof(ext4_acl_entry_short);
609 disk_entry->e_id = ext2fs_cpu_to_le32(entry->e_id);
610 e += sizeof(ext4_acl_entry);
611 s += sizeof(ext4_acl_entry);
619 static errcode_t convert_disk_buffer_to_posix_acl(const void *value, size_t size,
620 void **out_buf, size_t *size_out)
622 posix_acl_xattr_header *header;
623 posix_acl_xattr_entry *entry;
624 const ext4_acl_header *ext_acl = (const ext4_acl_header *) value;
630 (size < sizeof(ext4_acl_header)) ||
631 (ext_acl->a_version != ext2fs_cpu_to_le32(EXT4_ACL_VERSION)))
634 err = ext2fs_get_mem(size * 2, &out);
638 header = (posix_acl_xattr_header *) out;
639 header->a_version = ext2fs_cpu_to_le32(POSIX_ACL_XATTR_VERSION);
640 entry = (posix_acl_xattr_entry *) (out + sizeof(posix_acl_xattr_header));
642 cp = (const char *) value + sizeof(ext4_acl_header);
643 size -= sizeof(ext4_acl_header);
646 const ext4_acl_entry *disk_entry = (const ext4_acl_entry *) cp;
648 entry->e_tag = ext2fs_le16_to_cpu(disk_entry->e_tag);
649 entry->e_perm = ext2fs_le16_to_cpu(disk_entry->e_perm);
651 switch(entry->e_tag) {
657 cp += sizeof(ext4_acl_entry_short);
658 size -= sizeof(ext4_acl_entry_short);
662 entry->e_id = ext2fs_le32_to_cpu(disk_entry->e_id);
663 cp += sizeof(ext4_acl_entry);
664 size -= sizeof(ext4_acl_entry);
667 ext2fs_free_mem(&out);
673 *size_out = ((char *) entry - out);
678 write_xattrs_to_buffer(ext2_filsys fs, struct ext2_xattr *attrs, int count,
679 void *entries_start, unsigned int storage_size,
680 unsigned int value_offset_correction, int write_hash)
682 struct ext2_xattr *x;
683 struct ext2_ext_attr_entry *e = entries_start;
684 char *end = (char *) entries_start + storage_size;
685 unsigned int value_size;
688 memset(entries_start, 0, storage_size);
689 for (x = attrs; x < attrs + count; x++) {
690 value_size = ((x->value_len + EXT2_EXT_ATTR_PAD - 1) /
691 EXT2_EXT_ATTR_PAD) * EXT2_EXT_ATTR_PAD;
693 /* Fill out e appropriately */
694 e->e_name_len = strlen(x->short_name);
695 e->e_name_index = x->name_index;
697 e->e_value_size = x->value_len;
698 e->e_value_inum = x->ea_ino;
701 memcpy((char *)e + sizeof(*e), x->short_name, e->e_name_len);
706 e->e_value_offs = end - (char *) entries_start +
707 value_offset_correction;
708 memcpy(end, x->value, e->e_value_size);
711 if (write_hash || x->ea_ino) {
712 err = ext2fs_ext_attr_hash_entry2(fs, e,
720 e = EXT2_EXT_ATTR_NEXT(e);
726 errcode_t ext2fs_xattrs_write(struct ext2_xattr_handle *handle)
728 ext2_filsys fs = handle->fs;
729 const unsigned int inode_size = EXT2_INODE_SIZE(fs->super);
730 struct ext2_inode_large *inode;
731 char *start, *block_buf = NULL;
732 struct ext2_ext_attr_header *header;
733 __u32 ea_inode_magic;
735 unsigned int storage_size;
739 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
741 if (i < sizeof(*inode))
743 err = ext2fs_get_memzero(i, &inode);
747 err = ext2fs_read_inode_full(fs, handle->ino, EXT2_INODE(inode),
752 /* If extra_isize isn't set, we need to set it now */
753 if (inode->i_extra_isize == 0 &&
754 inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
755 char *p = (char *)inode;
756 size_t extra = fs->super->s_want_extra_isize;
759 extra = sizeof(__u32);
760 memset(p + EXT2_GOOD_OLD_INODE_SIZE, 0, extra);
761 inode->i_extra_isize = extra;
763 if (inode->i_extra_isize & 3) {
764 err = EXT2_ET_INODE_CORRUPTED;
768 /* Does the inode have space for EA? */
769 if (inode->i_extra_isize < sizeof(inode->i_extra_isize) ||
770 inode_size <= EXT2_GOOD_OLD_INODE_SIZE + inode->i_extra_isize +
774 /* Write the inode EA */
775 ea_inode_magic = EXT2_EXT_ATTR_MAGIC;
776 memcpy(((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
777 inode->i_extra_isize, &ea_inode_magic, sizeof(__u32));
778 storage_size = inode_size - EXT2_GOOD_OLD_INODE_SIZE -
779 inode->i_extra_isize - sizeof(__u32);
780 start = ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
781 inode->i_extra_isize + sizeof(__u32);
783 err = write_xattrs_to_buffer(fs, handle->attrs, handle->ibody_count,
784 start, storage_size, 0, 0);
789 if (handle->ibody_count == handle->count &&
790 !ext2fs_file_acl_block(fs, EXT2_INODE(inode)))
793 /* Write the EA block */
794 err = ext2fs_get_memzero(fs->blocksize, &block_buf);
798 storage_size = fs->blocksize - sizeof(struct ext2_ext_attr_header);
799 start = block_buf + sizeof(struct ext2_ext_attr_header);
801 err = write_xattrs_to_buffer(fs, handle->attrs + handle->ibody_count,
802 handle->count - handle->ibody_count, start,
803 storage_size, start - block_buf, 1);
807 /* Write a header on the EA block */
808 header = (struct ext2_ext_attr_header *) block_buf;
809 header->h_magic = EXT2_EXT_ATTR_MAGIC;
810 header->h_refcount = 1;
811 header->h_blocks = 1;
813 /* Get a new block for writing */
814 err = prep_ea_block_for_write(fs, handle->ino, inode);
818 /* Finally, write the new EA block */
819 blk = ext2fs_file_acl_block(fs, EXT2_INODE(inode));
820 err = ext2fs_write_ext_attr3(fs, blk, block_buf, handle->ino);
825 blk = ext2fs_file_acl_block(fs, (struct ext2_inode *)inode);
826 if (!block_buf && blk) {
827 /* xattrs shrunk, free the block */
828 err = ext2fs_free_ext_attr(fs, handle->ino, inode);
833 /* Write the inode */
834 err = ext2fs_write_inode_full(fs, handle->ino, EXT2_INODE(inode),
840 ext2fs_free_mem(&block_buf);
842 ext2fs_free_mem(&inode);
846 static errcode_t read_xattrs_from_buffer(struct ext2_xattr_handle *handle,
847 struct ext2_inode_large *inode,
848 struct ext2_ext_attr_entry *entries,
849 unsigned int storage_size,
852 struct ext2_xattr *x;
853 struct ext2_ext_attr_entry *entry, *end;
855 unsigned int remain, prefix_len;
857 unsigned int values_size = storage_size +
858 ((char *)entries - value_start);
862 remain = storage_size;
863 while (remain >= sizeof(struct ext2_ext_attr_entry) &&
864 !EXT2_EXT_IS_LAST_ENTRY(end)) {
866 /* header eats this space */
867 remain -= sizeof(struct ext2_ext_attr_entry);
869 /* is attribute name valid? */
870 if (EXT2_EXT_ATTR_SIZE(end->e_name_len) > remain)
871 return EXT2_ET_EA_BAD_NAME_LEN;
873 /* attribute len eats this space */
874 remain -= EXT2_EXT_ATTR_SIZE(end->e_name_len);
875 end = EXT2_EXT_ATTR_NEXT(end);
879 remain = storage_size;
880 while (remain >= sizeof(struct ext2_ext_attr_entry) &&
881 !EXT2_EXT_IS_LAST_ENTRY(entry)) {
883 /* Allocate space for more attrs? */
884 if (handle->count == handle->capacity) {
885 err = ext2fs_xattrs_expand(handle, 4);
890 x = handle->attrs + handle->count;
892 /* header eats this space */
893 remain -= sizeof(struct ext2_ext_attr_entry);
895 /* attribute len eats this space */
896 remain -= EXT2_EXT_ATTR_SIZE(entry->e_name_len);
899 prefix = find_ea_prefix(entry->e_name_index);
900 prefix_len = (prefix ? strlen(prefix) : 0);
901 err = ext2fs_get_memzero(entry->e_name_len + prefix_len + 1,
906 memcpy(x->name, prefix, prefix_len);
907 if (entry->e_name_len)
908 memcpy(x->name + prefix_len,
909 (char *)entry + sizeof(*entry),
911 x->short_name = x->name + prefix_len;
912 x->name_index = entry->e_name_index;
914 /* Check & copy value */
915 if (!ext2fs_has_feature_ea_inode(handle->fs->super) &&
916 entry->e_value_inum != 0)
917 return EXT2_ET_BAD_EA_BLOCK_NUM;
919 if (entry->e_value_inum == 0) {
920 if (entry->e_value_size > remain)
921 return EXT2_ET_EA_BAD_VALUE_SIZE;
923 if (entry->e_value_offs + entry->e_value_size > values_size)
924 return EXT2_ET_EA_BAD_VALUE_OFFSET;
926 if (entry->e_value_size > 0 &&
927 value_start + entry->e_value_offs <
928 (char *)end + sizeof(__u32))
929 return EXT2_ET_EA_BAD_VALUE_OFFSET;
931 remain -= entry->e_value_size;
933 err = ext2fs_get_mem(entry->e_value_size, &x->value);
936 memcpy(x->value, value_start + entry->e_value_offs,
937 entry->e_value_size);
939 struct ext2_inode *ea_inode;
942 if (entry->e_value_offs != 0)
943 return EXT2_ET_EA_BAD_VALUE_OFFSET;
945 if (entry->e_value_size > (64 * 1024))
946 return EXT2_ET_EA_BAD_VALUE_SIZE;
948 err = ext2fs_get_mem(entry->e_value_size, &x->value);
952 err = ext2fs_file_open(handle->fs, entry->e_value_inum,
957 ea_inode = ext2fs_file_get_inode(ea_file);
958 if ((ea_inode->i_flags & EXT4_INLINE_DATA_FL) ||
959 !(ea_inode->i_flags & EXT4_EA_INODE_FL) ||
960 ea_inode->i_links_count == 0)
961 err = EXT2_ET_EA_INODE_CORRUPTED;
962 else if ((__u64) ext2fs_file_get_size(ea_file) !=
964 err = EXT2_ET_EA_BAD_VALUE_SIZE;
966 err = ext2fs_file_read(ea_file, x->value,
967 entry->e_value_size, 0);
968 ext2fs_file_close(ea_file);
973 x->ea_ino = entry->e_value_inum;
974 x->value_len = entry->e_value_size;
976 /* e_hash may be 0 in older inode's ea */
977 if (entry->e_hash != 0) {
979 void *data = (entry->e_value_inum != 0) ?
980 0 : value_start + entry->e_value_offs;
982 err = ext2fs_ext_attr_hash_entry2(handle->fs, entry,
986 if (entry->e_hash != hash) {
987 struct ext2_inode child;
989 /* Check whether this is an old Lustre-style
990 * ea_inode reference.
992 err = ext2fs_read_inode(handle->fs,
997 if (child.i_mtime != handle->ino ||
998 child.i_generation != inode->i_generation)
999 return EXT2_ET_BAD_EA_HASH;
1004 entry = EXT2_EXT_ATTR_NEXT(entry);
1010 static void xattrs_free_keys(struct ext2_xattr_handle *h)
1012 struct ext2_xattr *a = h->attrs;
1015 for (i = 0; i < h->capacity; i++) {
1017 ext2fs_free_mem(&a[i].name);
1019 ext2fs_free_mem(&a[i].value);
1025 /* fetch xattrs from an already-loaded inode */
1026 errcode_t ext2fs_xattrs_read_inode(struct ext2_xattr_handle *handle,
1027 struct ext2_inode_large *inode)
1030 struct ext2_ext_attr_header *header;
1031 __u32 ea_inode_magic;
1032 unsigned int storage_size;
1033 char *start, *block_buf = NULL;
1038 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
1040 xattrs_free_keys(handle);
1042 /* Does the inode have space for EA? */
1043 if (inode->i_extra_isize < sizeof(inode->i_extra_isize) ||
1044 EXT2_INODE_SIZE(handle->fs->super) <= EXT2_GOOD_OLD_INODE_SIZE +
1045 inode->i_extra_isize +
1048 if (inode->i_extra_isize & 3) {
1049 err = EXT2_ET_INODE_CORRUPTED;
1053 /* Look for EA in the inode */
1054 memcpy(&ea_inode_magic, ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
1055 inode->i_extra_isize, sizeof(__u32));
1056 if (ea_inode_magic == EXT2_EXT_ATTR_MAGIC) {
1057 storage_size = EXT2_INODE_SIZE(handle->fs->super) -
1058 EXT2_GOOD_OLD_INODE_SIZE - inode->i_extra_isize -
1060 start = ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
1061 inode->i_extra_isize + sizeof(__u32);
1063 err = read_xattrs_from_buffer(handle, inode,
1064 (struct ext2_ext_attr_entry *) start,
1065 storage_size, start);
1069 handle->ibody_count = handle->count;
1073 /* Look for EA in a separate EA block */
1074 blk = ext2fs_file_acl_block(handle->fs, EXT2_INODE(inode));
1076 if ((blk < handle->fs->super->s_first_data_block) ||
1077 (blk >= ext2fs_blocks_count(handle->fs->super))) {
1078 err = EXT2_ET_BAD_EA_BLOCK_NUM;
1082 err = ext2fs_get_mem(handle->fs->blocksize, &block_buf);
1086 err = ext2fs_read_ext_attr3(handle->fs, blk, block_buf,
1091 /* We only know how to deal with v2 EA blocks */
1092 header = (struct ext2_ext_attr_header *) block_buf;
1093 if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
1094 err = EXT2_ET_BAD_EA_HEADER;
1099 storage_size = handle->fs->blocksize -
1100 sizeof(struct ext2_ext_attr_header);
1101 start = block_buf + sizeof(struct ext2_ext_attr_header);
1102 err = read_xattrs_from_buffer(handle, inode,
1103 (struct ext2_ext_attr_entry *) start,
1104 storage_size, block_buf);
1109 ext2fs_free_mem(&block_buf);
1114 errcode_t ext2fs_xattrs_read(struct ext2_xattr_handle *handle)
1116 struct ext2_inode_large *inode;
1117 size_t inode_size = EXT2_INODE_SIZE(handle->fs->super);
1120 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
1122 if (inode_size < sizeof(*inode))
1123 inode_size = sizeof(*inode);
1124 err = ext2fs_get_memzero(inode_size, &inode);
1128 err = ext2fs_read_inode_full(handle->fs, handle->ino, EXT2_INODE(inode),
1129 EXT2_INODE_SIZE(handle->fs->super));
1133 err = ext2fs_xattrs_read_inode(handle, inode);
1136 ext2fs_free_mem(&inode);
1141 errcode_t ext2fs_xattrs_iterate(struct ext2_xattr_handle *h,
1142 int (*func)(char *name, char *value,
1144 ext2_ino_t inode_num, void *data),
1147 struct ext2_xattr *x;
1151 EXT2_CHECK_MAGIC(h, EXT2_ET_MAGIC_EA_HANDLE);
1152 for (x = h->attrs; x < h->attrs + h->count; x++) {
1153 ret = func(x->name, x->value, x->value_len, x->ea_ino, data);
1154 if (ret & XATTR_CHANGED)
1156 if (ret & XATTR_ABORT)
1161 return ext2fs_xattrs_write(h);
1165 errcode_t ext2fs_xattr_get(struct ext2_xattr_handle *h, const char *key,
1166 void **value, size_t *value_len)
1168 struct ext2_xattr *x;
1172 EXT2_CHECK_MAGIC(h, EXT2_ET_MAGIC_EA_HANDLE);
1173 for (x = h->attrs; x < h->attrs + h->count; x++) {
1174 if (strcmp(x->name, key))
1177 if (!(h->flags & XATTR_HANDLE_FLAG_RAW) &&
1178 ((strcmp(key, "system.posix_acl_default") == 0) ||
1179 (strcmp(key, "system.posix_acl_access") == 0))) {
1180 err = convert_disk_buffer_to_posix_acl(x->value, x->value_len,
1184 err = ext2fs_get_mem(x->value_len, &val);
1187 memcpy(val, x->value, x->value_len);
1189 *value_len = x->value_len;
1194 return EXT2_ET_EA_KEY_NOT_FOUND;
1197 errcode_t ext2fs_xattr_inode_max_size(ext2_filsys fs, ext2_ino_t ino,
1200 struct ext2_ext_attr_entry *entry;
1201 struct ext2_inode_large *inode;
1202 __u32 ea_inode_magic;
1203 unsigned int minoff;
1208 i = EXT2_INODE_SIZE(fs->super);
1209 if (i < sizeof(*inode))
1211 err = ext2fs_get_memzero(i, &inode);
1215 err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)inode,
1216 EXT2_INODE_SIZE(fs->super));
1220 /* Does the inode have size for EA? */
1221 if (EXT2_INODE_SIZE(fs->super) <= EXT2_GOOD_OLD_INODE_SIZE +
1222 inode->i_extra_isize +
1224 err = EXT2_ET_INLINE_DATA_NO_SPACE;
1228 minoff = EXT2_INODE_SIZE(fs->super) - sizeof(*inode) - sizeof(__u32);
1229 memcpy(&ea_inode_magic, ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
1230 inode->i_extra_isize, sizeof(__u32));
1231 if (ea_inode_magic == EXT2_EXT_ATTR_MAGIC) {
1232 /* has xattrs. calculate the size */
1233 start= ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
1234 inode->i_extra_isize + sizeof(__u32);
1235 entry = (struct ext2_ext_attr_entry *) start;
1236 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
1237 if (!entry->e_value_inum && entry->e_value_size) {
1238 unsigned int offs = entry->e_value_offs;
1242 entry = EXT2_EXT_ATTR_NEXT(entry);
1244 *size = minoff - ((char *)entry - (char *)start) - sizeof(__u32);
1246 /* no xattr. return a maximum size */
1247 *size = EXT2_EXT_ATTR_SIZE(minoff -
1248 EXT2_EXT_ATTR_LEN(strlen("data")) -
1249 EXT2_EXT_ATTR_ROUND - sizeof(__u32));
1253 ext2fs_free_mem(&inode);
1257 static errcode_t xattr_create_ea_inode(ext2_filsys fs, const void *value,
1258 size_t value_len, ext2_ino_t *ea_ino)
1260 struct ext2_inode inode;
1266 ret = ext2fs_new_inode(fs, 0, 0, 0, &ino);
1270 memset(&inode, 0, sizeof(inode));
1271 inode.i_flags |= EXT4_EA_INODE_FL;
1272 if (ext2fs_has_feature_extents(fs->super))
1273 inode.i_flags |= EXT4_EXTENTS_FL;
1275 inode.i_mode = LINUX_S_IFREG | 0600;
1276 inode.i_links_count = 1;
1277 ret = ext2fs_write_new_inode(fs, ino, &inode);
1281 * ref_count and hash utilize inode's i_*time fields.
1282 * ext2fs_write_new_inode() call above initializes these fields with
1283 * current time. That's why ref count and hash updates are done
1286 ext2fs_set_ea_inode_ref(&inode, 1);
1287 hash = ext2fs_crc32c_le(fs->csum_seed, value, value_len);
1288 ext2fs_set_ea_inode_hash(&inode, hash);
1290 ret = ext2fs_write_inode(fs, ino, &inode);
1294 ret = ext2fs_file_open(fs, ino, EXT2_FILE_WRITE, &file);
1297 ret = ext2fs_file_write(file, value, value_len, NULL);
1298 ext2fs_file_close(file);
1302 ext2fs_inode_alloc_stats2(fs, ino, 1 /* inuse */, 0 /* isdir */);
1308 static errcode_t xattr_inode_dec_ref(ext2_filsys fs, ext2_ino_t ino)
1310 struct ext2_inode_large inode;
1314 ret = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
1319 ref_count = ext2fs_get_ea_inode_ref(EXT2_INODE(&inode));
1321 ext2fs_set_ea_inode_ref(EXT2_INODE(&inode), ref_count);
1326 inode.i_links_count = 0;
1327 inode.i_dtime = fs->now ? fs->now : time(0);
1329 ret = ext2fs_free_ext_attr(fs, ino, &inode);
1333 if (ext2fs_inode_has_valid_blocks2(fs, (struct ext2_inode *)&inode)) {
1334 ret = ext2fs_punch(fs, ino, (struct ext2_inode *)&inode, NULL,
1340 ext2fs_inode_alloc_stats2(fs, ino, -1 /* inuse */, 0 /* is_dir */);
1343 ret = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
1349 static errcode_t xattr_update_entry(ext2_filsys fs, struct ext2_xattr *x,
1350 const char *name, const char *short_name,
1351 int index, const void *value,
1352 size_t value_len, int in_inode)
1354 ext2_ino_t ea_ino = 0;
1355 void *new_value = NULL;
1356 char *new_name = NULL;
1361 name_len = strlen(name);
1362 ret = ext2fs_get_mem(name_len + 1, &new_name);
1365 memcpy(new_name, name, name_len + 1);
1368 ret = ext2fs_get_mem(value_len, &new_value);
1371 memcpy(new_value, value, value_len);
1374 ret = xattr_create_ea_inode(fs, value, value_len, &ea_ino);
1380 ret = xattr_inode_dec_ref(fs, x->ea_ino);
1387 x->short_name = new_name + (short_name - name);
1389 x->name_index = index;
1392 ext2fs_free_mem(&x->value);
1393 x->value = new_value;
1394 x->value_len = value_len;
1399 ext2fs_free_mem(&new_name);
1401 ext2fs_free_mem(&new_value);
1403 xattr_inode_dec_ref(fs, ea_ino);
1407 static int xattr_find_position(struct ext2_xattr *attrs, int count,
1408 const char *shortname, int name_idx)
1410 struct ext2_xattr *x;
1412 int shortname_len, x_shortname_len;
1414 shortname_len = strlen(shortname);
1416 for (i = 0, x = attrs; i < count; i++, x++) {
1417 if (name_idx < x->name_index)
1419 if (name_idx > x->name_index)
1422 x_shortname_len = strlen(x->short_name);
1423 if (shortname_len < x_shortname_len)
1425 if (shortname_len > x_shortname_len)
1428 if (memcmp(shortname, x->short_name, shortname_len) <= 0)
1434 static errcode_t xattr_array_update(struct ext2_xattr_handle *h,
1436 const void *value, size_t value_len,
1437 int ibody_free, int block_free,
1438 int old_idx, int in_inode)
1440 struct ext2_xattr tmp;
1443 int name_len, name_idx = 0;
1444 const char *shortname = name;
1448 find_ea_index(name, &shortname, &name_idx);
1449 name_len = strlen(shortname);
1451 needed = EXT2_EXT_ATTR_LEN(name_len);
1453 needed += EXT2_EXT_ATTR_SIZE(value_len);
1455 if (old_idx >= 0 && old_idx < h->ibody_count) {
1456 ibody_free += EXT2_EXT_ATTR_LEN(name_len);
1457 if (!h->attrs[old_idx].ea_ino)
1458 ibody_free += EXT2_EXT_ATTR_SIZE(
1459 h->attrs[old_idx].value_len);
1462 if (needed <= ibody_free) {
1464 new_idx = h->ibody_count;
1469 /* Update the existing entry. */
1470 ret = xattr_update_entry(h->fs, &h->attrs[old_idx], name,
1471 shortname, name_idx, value,
1472 value_len, in_inode);
1475 if (h->ibody_count <= old_idx) {
1476 /* Move entry from block to the end of ibody. */
1477 tmp = h->attrs[old_idx];
1478 memmove(h->attrs + h->ibody_count + 1,
1479 h->attrs + h->ibody_count,
1480 (old_idx - h->ibody_count) * sizeof(*h->attrs));
1481 h->attrs[h->ibody_count] = tmp;
1487 if (h->ibody_count <= old_idx) {
1488 block_free += EXT2_EXT_ATTR_LEN(name_len);
1489 if (!h->attrs[old_idx].ea_ino)
1491 EXT2_EXT_ATTR_SIZE(h->attrs[old_idx].value_len);
1494 if (needed > block_free)
1495 return EXT2_ET_EA_NO_SPACE;
1498 /* Update the existing entry. */
1499 ret = xattr_update_entry(h->fs, &h->attrs[old_idx], name,
1500 shortname, name_idx, value,
1501 value_len, in_inode);
1504 if (old_idx < h->ibody_count) {
1506 * Move entry from ibody to the block. Note that
1507 * entries in the block are sorted.
1509 new_idx = xattr_find_position(h->attrs + h->ibody_count,
1510 h->count - h->ibody_count,
1511 shortname, name_idx);
1512 new_idx += h->ibody_count - 1;
1513 tmp = h->attrs[old_idx];
1514 memmove(h->attrs + old_idx, h->attrs + old_idx + 1,
1515 (new_idx - old_idx) * sizeof(*h->attrs));
1516 h->attrs[new_idx] = tmp;
1522 new_idx = xattr_find_position(h->attrs + h->ibody_count,
1523 h->count - h->ibody_count,
1524 shortname, name_idx);
1525 new_idx += h->ibody_count;
1529 if (h->count == h->capacity) {
1530 ret = ext2fs_xattrs_expand(h, 4);
1535 ret = xattr_update_entry(h->fs, &h->attrs[h->count], name, shortname,
1536 name_idx, value, value_len, in_inode);
1540 tmp = h->attrs[h->count];
1541 memmove(h->attrs + new_idx + 1, h->attrs + new_idx,
1542 (h->count - new_idx)*sizeof(*h->attrs));
1543 h->attrs[new_idx] = tmp;
1550 static int space_used(struct ext2_xattr *attrs, int count)
1553 struct ext2_xattr *x;
1556 for (i = 0, x = attrs; i < count; i++, x++) {
1557 len = strlen(x->short_name);
1558 total += EXT2_EXT_ATTR_LEN(len);
1560 total += EXT2_EXT_ATTR_SIZE(x->value_len);
1566 * The minimum size of EA value when you start storing it in an external inode
1567 * size of block - size of header - size of 1 entry - 4 null bytes
1569 #define EXT4_XATTR_MIN_LARGE_EA_SIZE(b) \
1570 ((b) - EXT2_EXT_ATTR_LEN(3) - sizeof(struct ext2_ext_attr_header) - 4)
1572 errcode_t ext2fs_xattr_set(struct ext2_xattr_handle *h,
1577 ext2_filsys fs = h->fs;
1578 const int inode_size = EXT2_INODE_SIZE(fs->super);
1579 struct ext2_inode_large *inode = NULL;
1580 struct ext2_xattr *x;
1582 int ibody_free, block_free;
1588 EXT2_CHECK_MAGIC(h, EXT2_ET_MAGIC_EA_HANDLE);
1590 ret = ext2fs_get_mem(value_len, &new_value);
1593 if (!(h->flags & XATTR_HANDLE_FLAG_RAW) &&
1594 ((strcmp(name, "system.posix_acl_default") == 0) ||
1595 (strcmp(name, "system.posix_acl_access") == 0))) {
1596 ret = convert_posix_acl_to_disk_buffer(value, value_len,
1597 new_value, &value_len);
1600 } else if (value_len)
1601 memcpy(new_value, value, value_len);
1603 /* Imitate kernel behavior by skipping update if value is the same. */
1604 for (x = h->attrs; x < h->attrs + h->count; x++) {
1605 if (!strcmp(x->name, name)) {
1606 if (!x->ea_ino && x->value_len == value_len &&
1608 !memcmp(x->value, new_value, value_len))) {
1612 old_idx = x - h->attrs;
1617 ret = ext2fs_get_memzero(inode_size, &inode);
1620 ret = ext2fs_read_inode_full(fs, h->ino,
1621 (struct ext2_inode *)inode,
1625 if (inode_size > EXT2_GOOD_OLD_INODE_SIZE) {
1626 extra_isize = inode->i_extra_isize;
1627 if (extra_isize == 0) {
1628 extra_isize = fs->super->s_want_extra_isize;
1629 if (extra_isize == 0)
1630 extra_isize = sizeof(__u32);
1632 ibody_free = inode_size - EXT2_GOOD_OLD_INODE_SIZE;
1633 ibody_free -= extra_isize;
1634 /* Extended attribute magic and final null entry. */
1635 ibody_free -= sizeof(__u32) * 2;
1636 ibody_free -= space_used(h->attrs, h->ibody_count);
1640 /* Inline data can only go to ibody. */
1641 if (strcmp(name, "system.data") == 0) {
1642 if (h->ibody_count <= old_idx) {
1643 ret = EXT2_ET_FILESYSTEM_CORRUPTED;
1646 ret = xattr_array_update(h, name, new_value, value_len,
1648 0 /* block_free */, old_idx,
1655 block_free = fs->blocksize;
1656 block_free -= sizeof(struct ext2_ext_attr_header);
1657 /* Final null entry. */
1658 block_free -= sizeof(__u32);
1659 block_free -= space_used(h->attrs + h->ibody_count,
1660 h->count - h->ibody_count);
1662 if (ext2fs_has_feature_ea_inode(fs->super) &&
1663 value_len > EXT4_XATTR_MIN_LARGE_EA_SIZE(fs->blocksize))
1666 ret = xattr_array_update(h, name, new_value, value_len, ibody_free,
1667 block_free, old_idx, in_inode);
1668 if (ret == EXT2_ET_EA_NO_SPACE && !in_inode &&
1669 ext2fs_has_feature_ea_inode(fs->super))
1670 ret = xattr_array_update(h, name, new_value, value_len,
1671 ibody_free, block_free, old_idx, 1 /* in_inode */);
1676 ret = ext2fs_xattrs_write(h);
1679 ext2fs_free_mem(&inode);
1680 ext2fs_free_mem(&new_value);
1684 errcode_t ext2fs_xattr_remove(struct ext2_xattr_handle *handle,
1687 struct ext2_xattr *x;
1688 struct ext2_xattr *end = handle->attrs + handle->count;
1690 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
1691 for (x = handle->attrs; x < end; x++) {
1692 if (strcmp(x->name, key) == 0) {
1693 ext2fs_free_mem(&x->name);
1694 ext2fs_free_mem(&x->value);
1696 xattr_inode_dec_ref(handle->fs, x->ea_ino);
1697 memmove(x, x + 1, (end - x - 1)*sizeof(*x));
1698 memset(end - 1, 0, sizeof(*end));
1699 if (x < handle->attrs + handle->ibody_count)
1700 handle->ibody_count--;
1702 return ext2fs_xattrs_write(handle);
1706 /* no key found, success! */
1710 errcode_t ext2fs_xattrs_open(ext2_filsys fs, ext2_ino_t ino,
1711 struct ext2_xattr_handle **handle)
1713 struct ext2_xattr_handle *h;
1716 if (!ext2fs_has_feature_xattr(fs->super) &&
1717 !ext2fs_has_feature_inline_data(fs->super))
1718 return EXT2_ET_MISSING_EA_FEATURE;
1720 err = ext2fs_get_memzero(sizeof(*h), &h);
1724 h->magic = EXT2_ET_MAGIC_EA_HANDLE;
1726 err = ext2fs_get_arrayzero(h->capacity, sizeof(struct ext2_xattr),
1729 ext2fs_free_mem(&h);
1739 errcode_t ext2fs_xattrs_close(struct ext2_xattr_handle **handle)
1741 struct ext2_xattr_handle *h = *handle;
1743 EXT2_CHECK_MAGIC(h, EXT2_ET_MAGIC_EA_HANDLE);
1744 xattrs_free_keys(h);
1745 ext2fs_free_mem(&h->attrs);
1746 ext2fs_free_mem(handle);
1750 errcode_t ext2fs_xattrs_count(struct ext2_xattr_handle *handle, size_t *count)
1752 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
1753 *count = handle->count;
1757 errcode_t ext2fs_xattrs_flags(struct ext2_xattr_handle *handle,
1758 unsigned int *new_flags, unsigned int *old_flags)
1760 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
1762 *old_flags = handle->flags;
1764 handle->flags = *new_flags;
1768 struct ext2_attr_info {
1775 struct ext2_attr_search {
1776 struct ext2_ext_attr_entry *first;
1779 struct ext2_ext_attr_entry *here;
1783 struct ext2_attr_ibody_find {
1785 struct ext2_attr_search s;
1788 struct ext2_attr_block_find {
1789 struct ext2_attr_search s;
1793 void ext2fs_attr_shift_entries(struct ext2_ext_attr_entry *entry,
1794 int value_offs_shift, char *to,
1797 struct ext2_ext_attr_entry *last = entry;
1799 /* Adjust the value offsets of the entries */
1800 for (; !EXT2_EXT_IS_LAST_ENTRY(last); last = EXT2_EXT_ATTR_NEXT(last)) {
1801 if (!last->e_value_inum && last->e_value_size) {
1802 last->e_value_offs = last->e_value_offs +
1806 /* Shift the entries by n bytes and zero freed space in inode */
1807 memmove(to, from, n);
1809 memset(from, 0, to - from);
1813 * This function returns the free space present in the inode or the EA block.
1814 * total is number of bytes taken up by the EA entries and is used to shift
1815 * the EAs in ext2fs_expand_extra_isize().
1817 int ext2fs_attr_free_space(struct ext2_ext_attr_entry *last,
1818 int *min_offs, char *base, int *total)
1820 for (; !EXT2_EXT_IS_LAST_ENTRY(last); last = EXT2_EXT_ATTR_NEXT(last)) {
1821 *total += EXT2_EXT_ATTR_LEN(last->e_name_len);
1822 if (!last->e_value_inum && last->e_value_size) {
1823 int offs = last->e_value_offs;
1824 if (offs < *min_offs)
1829 return *min_offs - ((char *)last - base) - sizeof(__u32);
1832 static errcode_t ext2fs_attr_check_names(struct ext2_ext_attr_entry *entry,
1835 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
1836 struct ext2_ext_attr_entry *next = EXT2_EXT_ATTR_NEXT(entry);
1837 if ((char *)next >= end)
1838 return EXT2_ET_EA_BAD_ENTRIES;
1844 /* The unused parameter used to be the blocksize, but with in-inode xattrs
1845 * the xattr storage area size depends on where the xattrs are kept. Keep
1846 * this parameter for API/ABI compatibility, but it is not needed. */
1847 static errcode_t ext2fs_attr_find_entry(struct ext2_ext_attr_entry **pentry,
1848 int name_index, const char *name,
1849 int unused, int sorted)
1851 struct ext2_ext_attr_entry *entry;
1856 return EXT2_ET_EA_BAD_NAME;
1858 name_len = strlen(name);
1860 for (; !EXT2_EXT_IS_LAST_ENTRY(entry);
1861 entry = EXT2_EXT_ATTR_NEXT(entry)) {
1862 cmp = name_index - entry->e_name_index;
1864 cmp = name_len - entry->e_name_len;
1866 cmp = memcmp(name, entry->e_name, name_len);
1867 if (cmp <= 0 && (sorted || cmp == 0))
1872 return cmp ? EXT2_ET_EA_NAME_NOT_FOUND : 0;
1875 static errcode_t ext2fs_attr_block_find(ext2_filsys fs,struct ext2_inode *inode,
1876 struct ext2_attr_info *i,
1877 struct ext2_attr_block_find *bs)
1879 struct ext2_ext_attr_header *header;
1882 if (inode->i_file_acl) {
1883 /* The inode already has an extended attribute block. */
1884 error = ext2fs_get_mem(fs->blocksize, &bs->block);
1887 error = ext2fs_read_ext_attr(fs, inode->i_file_acl, bs->block);
1891 header = BHDR(bs->block);
1892 if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
1893 error = EXT2_ET_EA_BAD_MAGIC;
1897 /* Find the named attribute. */
1898 bs->s.base = bs->block;
1899 bs->s.first = (struct ext2_ext_attr_entry *)(header + 1);
1900 bs->s.end = bs->block + fs->blocksize;
1901 bs->s.here = bs->s.first;
1902 error = ext2fs_attr_find_entry(&bs->s.here, i->name_index,
1903 i->name, fs->blocksize, 1);
1904 if (error && error != EXT2_ET_EA_NAME_NOT_FOUND)
1906 bs->s.not_found = error;
1911 if (error && bs->block)
1912 ext2fs_free_mem(&bs->block);
1916 static errcode_t ext2fs_attr_ibody_find(ext2_filsys fs,
1917 struct ext2_inode_large *inode,
1918 struct ext2_attr_info *i,
1919 struct ext2_attr_ibody_find *is)
1923 if (EXT2_INODE_SIZE(fs->super) == EXT2_GOOD_OLD_INODE_SIZE)
1926 if (inode->i_extra_isize == 0)
1929 is->s.first = &IHDR(inode)->h_first_entry[0];
1930 is->s.base = (char *)is->s.first;
1931 is->s.here = is->s.first;
1932 is->s.end = (char *)inode + EXT2_INODE_SIZE(fs->super);
1933 if (IHDR(inode)->h_magic == EXT2_EXT_ATTR_MAGIC) {
1934 error = ext2fs_attr_check_names(is->s.first, is->s.end);
1937 /* Find the named attribute. */
1938 error = ext2fs_attr_find_entry(&is->s.here, i->name_index,
1939 i->name, is->s.end -
1940 (char *)is->s.base, 0);
1941 if (error && error != EXT2_ET_EA_NAME_NOT_FOUND)
1943 is->s.not_found = error;
1949 static errcode_t ext2fs_attr_set_entry(ext2_filsys fs, struct ext2_attr_info *i,
1950 struct ext2_attr_search *s)
1952 struct ext2_ext_attr_entry *last;
1953 int free, min_offs = s->end - s->base, name_len = strlen(i->name);
1955 /* Compute min_offs and last. */
1956 for (last = s->first; !EXT2_EXT_IS_LAST_ENTRY(last);
1957 last = EXT2_EXT_ATTR_NEXT(last)) {
1958 if (!last->e_value_inum && last->e_value_size) {
1959 int offs = last->e_value_offs;
1961 if (offs < min_offs)
1965 free = min_offs - ((char *)last - s->base) - sizeof(__u32);
1967 if (!s->not_found) {
1968 if (!s->here->e_value_inum && s->here->e_value_size) {
1969 int size = s->here->e_value_size;
1970 free += EXT2_EXT_ATTR_SIZE(size);
1972 free += EXT2_EXT_ATTR_LEN(name_len);
1975 if (free < EXT2_EXT_ATTR_LEN(name_len) +
1976 EXT2_EXT_ATTR_SIZE(i->value_len))
1977 return EXT2_ET_EA_NO_SPACE;
1980 if (i->value && s->not_found) {
1981 /* Insert the new name. */
1982 int size = EXT2_EXT_ATTR_LEN(name_len);
1983 int rest = (char *)last - (char *)s->here + sizeof(__u32);
1985 memmove((char *)s->here + size, s->here, rest);
1986 memset(s->here, 0, size);
1987 s->here->e_name_index = i->name_index;
1988 s->here->e_name_len = name_len;
1989 memcpy(s->here->e_name, i->name, name_len);
1991 if (!s->here->e_value_inum && s->here->e_value_size) {
1992 char *first_val = s->base + min_offs;
1993 int offs = s->here->e_value_offs;
1994 char *val = s->base + offs;
1995 int size = EXT2_EXT_ATTR_SIZE(s->here->e_value_size);
1998 size == EXT2_EXT_ATTR_SIZE(i->value_len)) {
1999 /* The old and the new value have the same
2000 size. Just replace. */
2001 s->here->e_value_size = i->value_len;
2002 memset(val + size - EXT2_EXT_ATTR_PAD, 0,
2003 EXT2_EXT_ATTR_PAD); /* Clear pad bytes */
2004 memcpy(val, i->value, i->value_len);
2008 /* Remove the old value. */
2009 memmove(first_val + size, first_val, val - first_val);
2010 memset(first_val, 0, size);
2011 s->here->e_value_size = 0;
2012 s->here->e_value_offs = 0;
2015 /* Adjust all value offsets. */
2017 while (!EXT2_EXT_IS_LAST_ENTRY(last)) {
2018 int o = last->e_value_offs;
2020 if (!last->e_value_inum &&
2021 last->e_value_size && o < offs)
2022 last->e_value_offs = o + size;
2023 last = EXT2_EXT_ATTR_NEXT(last);
2027 /* Remove the old name. */
2028 int size = EXT2_EXT_ATTR_LEN(name_len);
2030 last = ENTRY((char *)last - size);
2031 memmove((char *)s->here, (char *)s->here + size,
2032 (char *)last - (char *)s->here + sizeof(__u32));
2033 memset(last, 0, size);
2038 /* Insert the new value. */
2039 s->here->e_value_size = i->value_len;
2041 int size = EXT2_EXT_ATTR_SIZE(i->value_len);
2042 char *val = s->base + min_offs - size;
2044 s->here->e_value_offs = min_offs - size;
2045 memset(val + size - EXT2_EXT_ATTR_PAD, 0,
2046 EXT2_EXT_ATTR_PAD); /* Clear the pad bytes. */
2047 memcpy(val, i->value, i->value_len);
2054 static errcode_t ext2fs_attr_block_set(ext2_filsys fs, struct ext2_inode *inode,
2055 struct ext2_attr_info *i,
2056 struct ext2_attr_block_find *bs)
2058 struct ext2_attr_search *s = &bs->s;
2059 char *new_buf = NULL, *old_block = NULL;
2064 if (i->value && i->value_len > fs->blocksize)
2065 return EXT2_ET_EA_NO_SPACE;
2068 if (BHDR(s->base)->h_refcount != 1) {
2069 int offset = (char *)s->here - bs->block;
2071 /* Decrement the refcount of the shared block */
2072 old_block = s->base;
2073 BHDR(s->base)->h_refcount -= 1;
2075 error = ext2fs_get_mem(fs->blocksize, &s->base);
2079 memcpy(s->base, bs->block, fs->blocksize);
2080 s->first = ENTRY(BHDR(s->base)+1);
2081 BHDR(s->base)->h_refcount = 1;
2082 s->here = ENTRY(s->base + offset);
2083 s->end = s->base + fs->blocksize;
2086 error = ext2fs_get_mem(fs->blocksize, &s->base);
2090 memset(s->base, 0, fs->blocksize);
2091 BHDR(s->base)->h_magic = EXT2_EXT_ATTR_MAGIC;
2092 BHDR(s->base)->h_blocks = 1;
2093 BHDR(s->base)->h_refcount = 1;
2094 s->first = ENTRY(BHDR(s->base)+1);
2095 s->here = ENTRY(BHDR(s->base)+1);
2096 s->end = s->base + fs->blocksize;
2099 error = ext2fs_attr_set_entry(fs, i, s);
2103 if (!EXT2_EXT_IS_LAST_ENTRY(s->first))
2104 ext2fs_attr_rehash(BHDR(s->base), s->here);
2106 if (!EXT2_EXT_IS_LAST_ENTRY(s->first)) {
2107 if (bs->block && bs->block == s->base) {
2108 /* We are modifying this block in-place */
2109 new_buf = bs->block;
2110 blk = inode->i_file_acl;
2111 error = ext2fs_write_ext_attr(fs, blk, s->base);
2115 /* We need to allocate a new block */
2116 error = ext2fs_new_block(fs, 0, 0, &blk);
2119 ext2fs_block_alloc_stats(fs, blk, 1);
2120 error = ext2fs_write_ext_attr(fs, blk, s->base);
2125 BHDR(s->base)->h_refcount -= 1;
2126 error = ext2fs_write_ext_attr(fs,
2135 /* Update the i_blocks if we added a new EA block */
2136 if (!inode->i_file_acl && new_buf)
2137 inode->i_blocks += fs->blocksize / 512;
2138 /* Update the inode. */
2139 inode->i_file_acl = new_buf ? blk : 0;
2143 ext2fs_free_mem(&s->base);
2147 static errcode_t ext2fs_attr_ibody_set(ext2_filsys fs,
2148 struct ext2_inode_large *inode,
2149 struct ext2_attr_info *i,
2150 struct ext2_attr_ibody_find *is)
2152 struct ext2_attr_search *s = &is->s;
2155 if (EXT2_INODE_SIZE(fs->super) == EXT2_GOOD_OLD_INODE_SIZE)
2156 return EXT2_ET_EA_NO_SPACE;
2158 error = ext2fs_attr_set_entry(fs, i, s);
2162 if (!EXT2_EXT_IS_LAST_ENTRY(s->first))
2163 IHDR(inode)->h_magic = EXT2_EXT_ATTR_MAGIC;
2165 IHDR(inode)->h_magic = 0;
2167 return ext2fs_write_inode_full(fs, is->ino, (struct ext2_inode *)inode,
2168 EXT2_INODE_SIZE(fs->super));
2174 } ext2_attr_index_prefix[] = {
2175 [EXT2_ATTR_INDEX_USER] = { EXT2_ATTR_INDEX_USER_PREFIX,
2176 sizeof(EXT2_ATTR_INDEX_USER_PREFIX) },
2177 [EXT2_ATTR_INDEX_POSIX_ACL_ACCESS] = {
2178 EXT2_ATTR_INDEX_POSIX_ACL_ACCESS_PREFIX,
2179 sizeof(EXT2_ATTR_INDEX_POSIX_ACL_ACCESS_PREFIX) },
2180 [EXT2_ATTR_INDEX_POSIX_ACL_DEFAULT] = {
2181 EXT2_ATTR_INDEX_POSIX_ACL_DEFAULT_PREFIX,
2182 sizeof(EXT2_ATTR_INDEX_POSIX_ACL_DEFAULT_PREFIX) },
2183 [EXT2_ATTR_INDEX_TRUSTED] = { EXT2_ATTR_INDEX_TRUSTED_PREFIX,
2184 sizeof(EXT2_ATTR_INDEX_TRUSTED_PREFIX) },
2185 [EXT2_ATTR_INDEX_LUSTRE] = { EXT2_ATTR_INDEX_LUSTRE_PREFIX,
2186 sizeof(EXT2_ATTR_INDEX_LUSTRE_PREFIX) },
2187 [EXT2_ATTR_INDEX_SECURITY] = { EXT2_ATTR_INDEX_SECURITY_PREFIX,
2188 sizeof(EXT2_ATTR_INDEX_SECURITY_PREFIX)},
2192 errcode_t ext2fs_attr_set(ext2_filsys fs, ext2_ino_t ino,
2193 struct ext2_inode *inode,
2194 int name_index, const char *name, const char *value,
2195 int value_len, int flags)
2197 struct ext2_inode_large *inode_large = NULL;
2198 struct ext2_attr_info i = {
2199 .name_index = name_index,
2202 .value_len = value_len,
2204 struct ext2_attr_ibody_find is = {
2206 .s = { .not_found = -ENODATA, },
2208 struct ext2_attr_block_find bs = {
2209 .s = { .not_found = -ENODATA, },
2214 return EXT2_ET_EA_BAD_NAME;
2215 if (strlen(name) > 255)
2216 return EXT2_ET_EA_NAME_TOO_BIG;
2218 /* If the prefix is still present, skip it */
2219 if (strncmp(name, ext2_attr_index_prefix[name_index].str,
2220 ext2_attr_index_prefix[name_index].len) == 0)
2221 i.name += ext2_attr_index_prefix[name_index].len;
2223 if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
2224 inode_large = (struct ext2_inode_large *)inode;
2226 error = ext2fs_attr_ibody_find(fs, inode_large, &i, &is);
2230 if (is.s.not_found) {
2231 error = ext2fs_attr_block_find(fs, inode, &i, &bs);
2236 if (is.s.not_found && bs.s.not_found) {
2237 error = EXT2_ET_EA_NAME_NOT_FOUND;
2238 if (flags & XATTR_REPLACE)
2244 error = EXT2_ET_EA_NAME_EXISTS;
2245 if (flags & XATTR_CREATE)
2250 if (!is.s.not_found &&
2251 (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE))
2252 error = ext2fs_attr_ibody_set(fs, inode_large, &i, &is);
2253 else if (!bs.s.not_found)
2254 error = ext2fs_attr_block_set(fs, inode, &i, &bs);
2256 if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE)
2257 error = ext2fs_attr_ibody_set(fs, inode_large, &i, &is);
2258 if (!error && !bs.s.not_found) {
2260 error = ext2fs_attr_block_set(fs, inode, &i, &bs);
2261 } else if (error == EXT2_ET_EA_NO_SPACE) {
2262 error = ext2fs_attr_block_set(fs, inode, &i, &bs);
2265 if (!is.s.not_found) {
2267 if (EXT2_INODE_SIZE(fs->super) >
2268 EXT2_GOOD_OLD_INODE_SIZE)
2269 error = ext2fs_attr_ibody_set(fs,
2270 inode_large, &i, &is);
2279 static errcode_t ext2fs_attr_check_block(ext2_filsys fs, char *buffer)
2281 if (BHDR(buffer)->h_magic != (EXT2_EXT_ATTR_MAGIC) ||
2282 BHDR(buffer)->h_blocks != 1)
2283 return EXT2_ET_EA_BAD_MAGIC;
2285 return ext2fs_attr_check_names((struct ext2_ext_attr_entry *)
2287 buffer + fs->blocksize);
2290 static errcode_t ext2fs_attr_block_get(ext2_filsys fs, struct ext2_inode *inode,
2291 int name_index, const char *name,
2292 void *buffer, size_t buffer_size,
2295 struct ext2_ext_attr_header *header = NULL;
2296 struct ext2_ext_attr_entry *entry;
2297 char *block_buf = NULL;
2300 error = EXT2_ET_EA_NAME_NOT_FOUND;
2301 if (!inode->i_file_acl)
2304 error = ext2fs_get_mem(fs->blocksize, &block_buf);
2307 error = ext2fs_read_ext_attr(fs, inode->i_file_acl, block_buf);
2311 error = ext2fs_attr_check_block(fs, block_buf);
2315 header = BHDR(block_buf);
2316 entry = (struct ext2_ext_attr_entry *)(header + 1);
2317 error = ext2fs_attr_find_entry(&entry, name_index, name,
2322 *easize = entry->e_value_size;
2324 if (entry->e_value_size > buffer_size) {
2325 error = EXT2_ET_EA_TOO_BIG;
2328 memcpy(buffer, block_buf + entry->e_value_offs,
2329 entry->e_value_size);
2335 ext2fs_free_mem(&block_buf);
2339 static errcode_t ext2fs_attr_check_ibody(ext2_filsys fs,
2340 struct ext2_inode_large *inode)
2342 const int inode_size = EXT2_INODE_SIZE(fs->super);
2344 if (inode_size == EXT2_GOOD_OLD_INODE_SIZE)
2345 return EXT2_ET_EA_NAME_NOT_FOUND;
2347 if (IHDR(inode)->h_magic != EXT2_EXT_ATTR_MAGIC)
2348 return EXT2_ET_EA_BAD_MAGIC;
2350 return ext2fs_attr_check_names(&IHDR(inode)->h_first_entry[0],
2351 (char *)inode + inode_size);
2355 static errcode_t ext2fs_attr_ibody_get(ext2_filsys fs,
2356 struct ext2_inode_large *inode,
2357 int name_index, const char *name,
2358 void *buffer, size_t buffer_size,
2361 struct ext2_ext_attr_entry *entry;
2364 error = ext2fs_attr_check_ibody(fs, inode);
2368 entry = &IHDR(inode)->h_first_entry[0];
2370 error = ext2fs_attr_find_entry(&entry, name_index, name,
2371 (char *)inode + EXT2_INODE_SIZE(fs->super) -
2376 *easize = entry->e_value_size;
2378 if (entry->e_value_size > buffer_size) {
2379 error = EXT2_ET_EA_TOO_BIG;
2382 memcpy(buffer, (char *)&IHDR(inode)->h_first_entry[0] +
2383 entry->e_value_offs, entry->e_value_size);
2391 errcode_t ext2fs_attr_get(ext2_filsys fs, struct ext2_inode *inode,
2392 int name_index, const char *name, char *buffer,
2393 size_t buffer_size, int *easize)
2397 error = ext2fs_attr_ibody_get(fs, (struct ext2_inode_large *)inode,
2398 name_index, name, buffer, buffer_size,
2400 if (error == EXT2_ET_EA_NAME_NOT_FOUND || error == EXT2_ET_EA_BAD_MAGIC)
2401 error = ext2fs_attr_block_get(fs, inode, name_index, name,
2402 buffer, buffer_size, easize);
2407 int ext2fs_attr_get_next_attr(struct ext2_ext_attr_entry *entry, int name_index,
2408 char *buffer, int buffer_size, int start)
2410 const int prefix_len = ext2_attr_index_prefix[name_index].len;
2413 if (!start && !EXT2_EXT_IS_LAST_ENTRY(entry))
2414 entry = EXT2_EXT_ATTR_NEXT(entry);
2416 for (; !EXT2_EXT_IS_LAST_ENTRY(entry);
2417 entry = EXT2_EXT_ATTR_NEXT(entry)) {
2420 if (name_index == entry->e_name_index)
2423 if (EXT2_EXT_IS_LAST_ENTRY(entry))
2426 total_len = prefix_len + entry->e_name_len + 1;
2427 if (buffer && total_len <= buffer_size) {
2428 memcpy(buffer, ext2_attr_index_prefix[name_index].str,
2430 memcpy(buffer + prefix_len, entry->e_name, entry->e_name_len);
2431 buffer[prefix_len + entry->e_name_len] = '\0';
2437 errcode_t ext2fs_expand_extra_isize(ext2_filsys fs, ext2_ino_t ino,
2438 struct ext2_inode_large *inode,
2439 int new_extra_isize, int *ret,
2442 struct ext2_inode *inode_buf = NULL;
2443 struct ext2_ext_attr_header *header = NULL;
2444 struct ext2_ext_attr_entry *entry = NULL, *last = NULL;
2445 struct ext2_attr_ibody_find is = {
2447 .s = { .not_found = EXT2_ET_EA_NO_SPACE, },
2449 struct ext2_attr_block_find bs = {
2450 .s = { .not_found = EXT2_ET_EA_NO_SPACE, },
2452 char *start, *end, *block_buf = NULL, *buffer =NULL, *b_entry_name=NULL;
2453 int total_ino = 0, total_blk, free, offs, tried_min_extra_isize = 0;
2454 int s_min_extra_isize = fs->super->s_min_extra_isize;
2455 errcode_t error = 0;
2458 *needed_size = new_extra_isize;
2459 error = ext2fs_get_mem(fs->blocksize, &block_buf);
2463 if (inode == NULL) {
2464 error = ext2fs_get_mem(EXT2_INODE_SIZE(fs->super), &inode_buf);
2468 error = ext2fs_read_inode_full(fs, ino, inode_buf,
2469 EXT2_INODE_SIZE(fs->super));
2473 inode = (struct ext2_inode_large *)inode_buf;
2477 if (inode->i_extra_isize >= new_extra_isize)
2480 start = (char *)inode + EXT2_GOOD_OLD_INODE_SIZE + inode->i_extra_isize;
2481 /* No extended attributes present */
2482 if (IHDR(inode)->h_magic != EXT2_EXT_ATTR_MAGIC) {
2484 EXT2_INODE_SIZE(fs->super) - EXT2_GOOD_OLD_INODE_SIZE -
2485 inode->i_extra_isize);
2486 inode->i_extra_isize = new_extra_isize;
2492 start += sizeof(__u32);
2493 end = (char *)inode + EXT2_INODE_SIZE(fs->super);
2494 last = entry = (struct ext2_ext_attr_entry *)start;
2496 /* Consider space takenup by magic number */
2497 total_ino = sizeof(__u32);
2498 free = ext2fs_attr_free_space(last, &offs, start, &total_ino);
2500 /* Enough free space available in the inode for expansion */
2501 if (free >= new_extra_isize) {
2502 ext2fs_attr_shift_entries(entry,
2503 inode->i_extra_isize - new_extra_isize,
2505 EXT2_GOOD_OLD_INODE_SIZE +
2507 start - sizeof(__u32), total_ino);
2508 inode->i_extra_isize = new_extra_isize;
2514 if (inode->i_file_acl) {
2515 error = ext2fs_read_ext_attr(fs, inode->i_file_acl, block_buf);
2519 header = BHDR(block_buf);
2520 if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
2521 error = EXT2_ET_EA_BAD_MAGIC;
2524 end = block_buf + fs->blocksize;
2525 last = entry = (struct ext2_ext_attr_entry *)(header+1);
2526 start = (char *)entry;
2528 free = ext2fs_attr_free_space(last, &offs, start, &total_blk);
2529 if (free < new_extra_isize) {
2530 if (!tried_min_extra_isize && s_min_extra_isize) {
2531 tried_min_extra_isize++;
2532 new_extra_isize = s_min_extra_isize;
2536 *ret = EXT2_EXPAND_EISIZE_NOSPC;
2537 error = EXT2_ET_EA_NO_SPACE;
2541 if (ret && *ret == EXT2_EXPAND_EISIZE_UNSAFE) {
2542 *ret = EXT2_EXPAND_EISIZE_NEW_BLOCK;
2546 free = fs->blocksize;
2549 while (new_extra_isize > 0) {
2550 int offs, size, entry_size;
2551 struct ext2_ext_attr_entry *small_entry = NULL;
2552 struct ext2_attr_info i = {
2556 unsigned int total_size, shift_bytes, temp = ~0U, extra_isize=0;
2558 start = (char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
2559 inode->i_extra_isize + sizeof(__u32);
2560 end = (char *)inode + EXT2_INODE_SIZE(fs->super);
2561 last = (struct ext2_ext_attr_entry *)start;
2563 /* Find the entry best suited to be pushed into EA block */
2565 for (; !EXT2_EXT_IS_LAST_ENTRY(last);
2566 last = EXT2_EXT_ATTR_NEXT(last)) {
2567 total_size = EXT2_EXT_ATTR_SIZE(last->e_value_size) +
2568 EXT2_EXT_ATTR_LEN(last->e_name_len);
2569 if (total_size <= free && total_size < temp) {
2570 if (total_size < new_extra_isize) {
2579 if (entry == NULL) {
2581 entry = small_entry;
2583 if (!tried_min_extra_isize &&
2584 s_min_extra_isize) {
2585 tried_min_extra_isize++;
2586 new_extra_isize = s_min_extra_isize;
2590 *ret = EXT2_EXPAND_EISIZE_NOSPC;
2591 error = EXT2_ET_EA_NO_SPACE;
2595 offs = entry->e_value_offs;
2596 size = entry->e_value_size;
2597 entry_size = EXT2_EXT_ATTR_LEN(entry->e_name_len);
2598 i.name_index = entry->e_name_index;
2599 error = ext2fs_get_mem(EXT2_EXT_ATTR_SIZE(size), &buffer);
2602 error = ext2fs_get_mem(entry->e_name_len + 1, &b_entry_name);
2605 /* Save the entry name and the entry value */
2606 memcpy((char *)buffer, (char *)start + offs,
2607 EXT2_EXT_ATTR_SIZE(size));
2608 memcpy((char *)b_entry_name, (char *)entry->e_name,
2610 b_entry_name[entry->e_name_len] = '\0';
2611 i.name = b_entry_name;
2613 error = ext2fs_attr_ibody_find(fs, inode, &i, &is);
2617 error = ext2fs_attr_set_entry(fs, &i, &is.s);
2621 entry = (struct ext2_ext_attr_entry *)start;
2622 if (entry_size + EXT2_EXT_ATTR_SIZE(size) >= new_extra_isize)
2623 shift_bytes = new_extra_isize;
2625 shift_bytes = entry_size + EXT2_EXT_ATTR_SIZE(size);
2626 ext2fs_attr_shift_entries(entry,
2627 inode->i_extra_isize - shift_bytes,
2628 (char *)inode +EXT2_GOOD_OLD_INODE_SIZE+
2629 extra_isize + shift_bytes,
2630 start - sizeof(__u32),
2631 total_ino - entry_size);
2633 extra_isize += shift_bytes;
2634 new_extra_isize -= shift_bytes;
2636 *needed_size = new_extra_isize;
2637 inode->i_extra_isize = extra_isize;
2639 i.name = b_entry_name;
2642 error = ext2fs_attr_block_find(fs, (struct ext2_inode *)inode,
2647 /* Add entry which was removed from the inode into the block */
2648 error = ext2fs_attr_block_set(fs, (struct ext2_inode *)inode,
2655 error = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)inode,
2656 EXT2_INODE_SIZE(fs->super));
2659 ext2fs_free_mem(&inode_buf);
2661 ext2fs_free_mem(&block_buf);
2663 ext2fs_free_mem(&buffer);
2665 ext2fs_free_mem(&b_entry_name);